In this clip, notice the boundary safety and his width outside of the hash pre-snap, it would be hard for buddy to cover 1/3 of the field, so we can rule out Cov. 3. That’s not the normal alignment for a Cov. 4 safe, is it? Nope, so we can rule out Cov. 4.

Once you see that safety pre-snap with that width and depth, get your eyes to the corners. What is their leverage? Inside? Outside? Head Up? Where are their eyes? How far off are they? If you look, these corners are locked in on their guy. Easy tell of man.